Here is a picture of the toggle linkage that lifts the motor up into the drive wheel. I revised this from a simple lever, and it works much better. Stepping down pulls the top bar forward, which lifts the motor. A couple of 90į joints and pivot points and it works pretty good.

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Ran it hard for three days with no major malfunctions. The way I had the dies set up to be interchangeable isn't going to work. It also hit much harder with a bit less space between the dies, but I was out of adjustment range, so I added a block of steel under the bottom die plate. I'll eventually need to lengthen the push arm to make up the adjustment. The weld between the bottom die and die plate cracked a little, and the bolt between the hammer shaft and top dies showed some pretty good wear. Looks like for the short term I'll have to weld up the interchangeable die parts to something more permanent, or at least change how the dies interchange. No structural failures or damage.